Re: [Plplot-general] plplot build error

[Alan W. I. <ir...@be...>]

On 2007-04-06 10:41-0700 winson wrote:

> With the information from the build log, I have
> managed to generate file "plhershey-unicode.h" by
> launching plhershey-unicode.exe with parameters on
> command-line. Then I copied the file manually to the
> "include" directory. My question now is, is it what
> this perticular build process all about?

Yes.

> In other
> words, will the file "plhershey-unicode.h" affect the
> subsequent build of other files? I looked through
> other "CMakeLists.txt" files, it seems okay. But I am
> not sure. Thanks.

The short answer was above, but if you want to follow the logic (which is
actually pretty easy to do if you also look at the CMake documentation at
http://cmake.org/HTML/Documentation.html) the relevant section of CMake
logic is as follows:

add_executable(plhershey-unicode-gen ${plhershey-unicode-gen_SRCS})

add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode.h
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode-gen${EXEEXT}
${CMAKE_SOURCE_DIR}/fonts/plhershey-unicode.csv
plhershey-unicode.h
DEPENDS
${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode-gen${EXEEXT}
${CMAKE_SOURCE_DIR}/fonts/plhershey-unicode.csv
)

# For cross-directory dependencies....
add_custom_target(
plhershey-unicode.h_built
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode.h
)

This is the implementation of an important chain of dependencies.  The
custom command depends on the add_executable via the DEPENDS
${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode-gen${EXEEXT}.  In turn, the
custom target depends on the custom command via DEPENDS
${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode.h. Furthermore, if you look at
src/CMakeLists.txt, you will see our core library depends on the above
custom target via the

add_dependencies(plplot${LIB_TAG} plhershey-unicode.h_built)

command.  Through this chain of dependencies, the timing of various builds
is enforced. ${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode-gen${EXEEXT}
always gets built first, then
${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode.h is built, then finally the
plplot${LIB_TAG} core library is built in the build tree.  Also, and just as
important, no unnecessary builds of
${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode-gen${EXEEXT},
${CMAKE_CURRENT_BINARY_DIR}/plhershey-unicode.h, or the library are done.

If you are trying to mimic any of this by hand (due to some platform
problem), then be sure to keep the same order and place your results in the
appropriate build-tree subdirectory (which normally is separate from the
corresponding source tree directory).

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the Yorick front-end to PLplot (yplot.sf.net); the
Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
__________________________

Linux-powered Science
__________________________